Over at Wired, a deaf iPhone user explains precisely why AT&T’s decision to take a core feature of iOS 6 — FaceTime video chat over cellular data networks — and make it available only to those with a shared-mobile plan specifically harms the deaf by forcing them to pay a higher rate with no associated benefit. The same argument is valid for all subscribers, but has particular resonance for those who use sign language. follow link
Viewing Wi-Fi Details in Snow Leopard
In Snow Leopard, hold down the Option key before clicking the AirPort menu. Doing so reveals additional technical details including which standards, speeds, and frequencies you're using to connect, as well as what's in use by other networks. With the Option key held down and with a network already joined, the AirPort menu reveals seven pieces of information: the PHY Mode, the MAC (Media Access Control) address, the channel and band in use, the security method that's in use, the RSSI (Received Signal Strength Indication) measurement, the transmit rate, and the MCS Index. In Leopard, some, but not all, of these details are revealed by Option-clicking the AirPort menu.
Deaf Deterred by AT&T’s FaceTime over Cellular Policy